I have a Moen single curved rod. I've only had it for a month or so, so it's too early for rust. However, I purchased it based on very good reviews, both here and on Amazon. I was originally planning on getting a straight tension rod, because I needed my head examined. I had this notion that drilling holes in my new tub/shower surround tile was too heinous to consider. I even talked myself into thinking that the straight rod provided enough room while taking a shower. That may be sorta true. I'm small and don't fling my arms around a lot in the shower. I would have been fine and not emotionally scarred. I finally had a moment of reason and let them install the curved rod. Not, mind you, until I'd been very scientific about finding the exact sweet spot for its placement. It is wonderful. Seriously. The shower feels quite spacious in width with the curtain closed. I also like that outside the shower it doesn't look at all strange or bulge-y. Almost like an optical illusion. Don't worry about the point where the two sections of rod meet. There's a little plastic thing that slides over it and if you use rings with ball bearings, they slide over it without a hitch.

Thank you for your comments ---- I can't believe I didn't think of the things you pointed out... they make so much sense. Our style is what I call "casual eclectic Hispanic", LOL. The walls are EK's Light Terracotta, medium-dark hardwood floors, stained wood trim around windows, dark blue leather sofas, red/blue area rug, etc. I'll try to take a picture. Because our look is casual, I want the tab-top curtains. We stayed two nights in a motel in Santa Fe that was decorated throughout with terracotta tile and had tabbed curtains. Anyway, the reason we want to add non-sheer curtains is because we want some privacy at night while we are watching TV in the living room which has a large window that faces the street. The sheers let in a lot of light during the day ---- which I LOVE -- but I would like to add some non-sheers to pull when we want privacy. I also considered --- I know this sounds weird, but stay with me ---- replacing these sheers with tab-top sheers, and adding tab-top curtains on the same rods, putting the sheers in the middle so when they are closed some light still comes in but they still offer privacy. I'll take pictures later and post them for help.

Wood closet dowling. I think it might come in a 2"diameter, and up to 10'-12' in length. It's sold by the foot at Home Depot or Lowe's. I've used it several times for heavier draperies which were lined ans quite wide, and it worked like a charm. It's much cheaper than an extra large store bought rod. You will also need to buy brackets for the ends as well as one in the middle. I use wood ones which are sold in the drapery hardware department. You can also paint or stain your rods/brackets, moreso the brackets since they will show.

You don’t use a double rod, you use double hooks. https://www.amazon.com/dp/B0042ZB1YI/ref=asc_df_B0042ZB1YI5496821/?tag=hyprod-20&creative=394997&creativeASIN=B0042ZB1YI&linkCode=df0&hvadid=193125023450&hvpos=1o2&hvnetw=g&hvrand=11328786871795924530&hvpone=&hvptwo=&hvqmt=&hvdev=t&hvdvcmdl=&hvlocint=&hvlocphy=9003353&hvtargid=pla-305594371330